One of the most credible UFO (unidentified flying object) encounters in American history unfolded in Minnesota in 1979. Marshall County Deputy Sheriff Val Johnson never claimed that he saw aliens or spaceships—merely that a force he could not identify collided with his car, cracking its windshield and leaving him unconscious. Johnson’s reasonable testimony and the evidence left behind on his vehicle made the event a popular case among those who study unidentified aerial phenomena.